package com.dpj.edu.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.dpj.edu.entity.Subject;
import com.dpj.edu.entity.excel.SubjectData;
import com.dpj.edu.service.SubjectService;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {
    //因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    //不能实现数据库操作
    public SubjectService subjectService;
    public SubjectExcelListener() {}
    public SubjectExcelListener(SubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //一行一行读取数据subjectData （为当前行数据对象也是咱们自定义的对应于表里的数据的那个对象实体）
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if(subjectData == null) {
            try {
                throw new Exception("文件数据为空");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        Subject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if(existOneSubject == null) { //没有相同一级分类，进行添加
            existOneSubject = new Subject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());//一级分类名称
            subjectService.save(existOneSubject);
        }
        //获取一级分类id值
        String pid=existOneSubject.getId();
        //添加二级分类
        //判断二级分类是否重复
        Subject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if(existTwoSubject == null) {
            existTwoSubject = new Subject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());//二级分类名称
            subjectService.save(existTwoSubject);
        }
    }
    //判断一级分类不能重复添加
    private Subject existOneSubject(SubjectService subjectService, String name) {
        QueryWrapper<Subject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        Subject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }
    //判断二级分类不能重复添加
    private Subject existTwoSubject(SubjectService subjectService,String name,String pid) {
        QueryWrapper<Subject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        Subject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
